Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Disconnect leads from the fan
Measurement:
Measure the resistance of the two fan coils:
Resistance between where the white and black wires were should be approximately 97 Ohms.
Resistance between where the red and black wires were should be approximately 51 Ohms.
Resistance between where the white and black wires were should be approximately 97 Ohms.
Resistance between where the red and black wires were should be approximately 51 Ohms.
Isolate as per TOPs P4
and refit as necessary